/Engine/Source/Runtime/Engine/Public/Slate/SGameLayerManager.h
virtual bool AddLayerForPlayer ( [ULocalPlayer](API\Runtime\Engine\Engine\ULocalPlayer) * Player, const [FName](API\Runtime\Core\UObject\FName) & LayerName, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IGameLayer](API\Runtime\Engine\Slate\IGameLayer) > Layer, int32 ZOrder )